A scientist studied how temperature affected the rate of photosynthesis in one plant species. Photosynthesis consists of reactions controlled by enzymes. Leaf discs were cut from a leaf and placed at different temperatures. For each temperature, the total surface area of the discs was kept constant. The volume of oxygen released by the leaf discs was measured and used to estimate the rate of photosynthesis. The outcomes are shown in Fig. 4.1.
(a)[1]
Identify the temperature that is optimum for photosynthesis in Fig. 4.1.
(b)[6]
Explain the pattern shown in Fig. 4.1.
(c)[2]
Explain why this was done.
(d)[1]
Suggest why not all oxygen made by the leaf is released.
(e)[2]
Describe the function of chlorophyll in photosynthesis.
Worked solution & mark scheme
This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The optimum temperature is $40^\circ\text{C}$.” …